How do I get rid of NSIS media popups?

I keep getting a bunch of popup ads. In the top bar, it says all of them are from NSIS Media. I ran Spybot, Norton Antivirus, and Ad-Aware, and none of these detected it on my computer, and the popups keep showing up. Does anyone know how to get rid of them? They show up really frequently, and it's starting to drive me crazy.

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